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Roof drain section.
Inner drains are resistant to freezing but can require careful maintenance to prevent problems.
P 1503 4 1 secondary emergency overflow drains or scuppers.
Design and installation of roof drainage systems shall comply with section 1503 of this code and sections 1106 and 1108 as applicable of the international plumbing code.
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The main benefit of inner drains is that the system is hidden from view.